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M O D U L E
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GNSS (GPS) Workflow and Integration into GIS
Karyn Nolan
Top 3 Questions
What is the accuracy of the equipment?
How do I have a picture as an attribute?
Why is my data in the ocean?
….other tips along the way
Differential Corrections
Autonomous – 10 m with uncorrected GPS
Satellite Based Augmentation System (SBAS) – 1-5 m – WAAS - US
– EGNOS - Europe
– MSAS – Japan
– GAGAN - India
Real Time Accuracy
VRS - Difference in Accuracy between traditional RTK and VRS
Future Trend
VRS subscription or Single Base broadcast – cell phone or radio
– http://www.trimble.com/infrastructure/services.aspx
Real Time Accuracy
VBS/WAAS/EGNOS
XP/G2
HP
CenterPoint RTX
RTK/VRS
2cm
4cm
10cm
15cm
100cm
0cm
Trimble VRS Now Network
Estonia
Czech
Germany
Netherlands
Ireland
Great-
Britain
Belgium
Lux
Madrid
U.S.: Alabama, Colorado, Florida, Illinois,
Iowa, Indiana, Kentucky, Mississippi and
Nebraska
Europe: Czech Republic, Estonia,
Great Britain, Germany,
Netherlands, Belgium, Luxembourg
& Ireland
Differential Corrections – Post Process
Post Processed Accuracy (PPA)
Corrections applied in office software – CORS
– Achieve Specifications of Equipment!!
Global Navigation Satellite System
What is the Global Navigation Satellite System, GNSS?
GPS – US Global Positioning System
GLONASS – Russian GLObal NAvigation Satellite System
Galileo – European Union (currently non-functional)
Questions
Pacific GPS, LLC
(808) 538-7477
www.pacificgps.com
